Originally Posted by Mercedes Lover
Now let's say I decide to go through with this, is the floor two seperate peices or one peice? From the looks of it there's the drivers side floor and the passenger side floor board. Also, do the rockers come off with the floor boards or are those seperate? I would like to keep the rockers attached to the floorboards seeing I'd need to have new rocker panels welded in as well.
You can buy separate replacement floor pans for front and back both sides. On my car, the back floors were still good. Besides, there is a crossbeam between the front and the back that would probably have to be removed to install a 1-piece floor.
You don't have to use the complete replacement floor. Just cut out the parts that are needed.
You can fix small non structural holes with POR15 and fibreglass. But don't
use that for anything structural. Structural, is the part of the floor pan that is above the under car frame rails. Looks like that is where you have a large hole, just like I did. Another structural part is the floor to door sill joint. The door sills/rockers act as longitudinal beams to support the vehicle. And then the firewall to cabin side and floor joints.
These are the sources for the Klockerholm patch panels:
'76-'85 FRONT FLOOR PANEL, DRIVER'S SIDE - KlokkerholmUSA
1976-1985 W123 - Rust Repair Panels - Page 2
I lightened up your pics so I could see where they were. Might as well post them here (they are at the bottom)
If welding is out, you may be able to cut patches from the Klockerholm pieces and adhere them to floor with an epoxy or new space age adhesive, then also though bolt or rivet through good part of floor. I did something like that, but just for the pedal support. Need backing plate or fender washers on underside.